Pump.



APPLICATION FILED MAYB ISI?.

P. SCHOU.

PUMP.

6 f6 s 12357 J Patented Dec. 18, 1917.

' Piani. soiiioii, or oornivHGEii, niii/inKQ kBe it knownthatLIg-PAULSoHoU,of Copenhagen, in the Kingdom of Denmark, Ahave `invented certain'new fand useful Improvements in Pumps, ofv which the follow ses aan;dan and me description f VThis invention refers to a pump, principallycharacterized Sin thaty the reciprocating movement ,of the'pistoii inlits stationary cylinder is caused by 'a :rotating leccentric v with tworoller-tracksone outer and on'e :inner-*each having its correspondingroller disposed on thejpis'ton, sothat the onerollertrack with itsroller vpushes the vpiston into,

andthe other roller-.track with. its roller pullsthe piston out ofthecylinden Y This driving-mechanism, `'especially in single-actioncylinders', makes it possible 'for the driving 'shaftI to'rbe-jo'uriialed close to the end of the cylinder, and thus the'coilstr'uctionis made sh0rt, which advantage may be still more enhancedby making re- 'cessesin the cylinder for thejroller-tracksandbyjournaling the rollers in corresponding `-recesses in the piston,so that the end surface ofthe piston, in' one of the deadcenterpositions, isin the immediate vicinity of the driving-shaft. I n fAnother advantage in this construction is the very slightV frictionbetween the powertransmitting members, especially when the rollers runon balls. n

Another advantage consists in that oneis not restrictedQ tothe pistonmovement which is characteristic of crank and connectingvrod v4or.eccentric and eccentric-strap, with maximum speed in the middle of thestroke and Veven transition between the 4one stroke .and the next, it.being .possibleito Vary the shape of the roller-tracks in differentways, fromrthe circular shape1thereby', for `ifnstance, attaining amaximum speed at other periods of time than the middle ofthe stroke, orattaining theadvantage that the piston, in .one `or both dead-.centerpositions, is at rest during longer periods, which isof importance inpumps which run at high speed;

This invention is especially suitable for pumps with two .or morecylinders, inasmuch as two cylindersv may be disposed opposite eachother with their common ec-v centric. (roller-track) between their ends,which face eacli.other;. or several cylinders may bel disposed in thefoinof astar around a common eccentric. Owing to the short yspaiafaibfraaarasa intenten nee. 18,19171.

Application mea May s, 1917. f serial No; 167,310.

construction which characterizes this invention, ksuch .amulti-cylindered pumpwill, in

its entirety, only take a comparatively small space'. Y When a p uinpjofthis/kind is tobey used for pumping airor gas, for'instanc'e, ascompresser or vacuum pump, the cylinder, or cylinders are connected witha chamber ora pipe whichlco'ntains a sealing or lubricating means insuch a manner that the latter will .constantly be spread. out on'v azone of the piston or pistons and will be carried from there ,outthrough the Voutlet x valve, together with the yair .or`4 gas, and`Athen beCarri'ed automatically back tothe 'aforesaid-pipa p -V lOneform of construction of i12-cylinder p air-'pump of.V the kind here-set` forth, with the aforesaid 'circulation of a sealing or lubricatingmeans 1 is ydiagramiiiatically shown, by wayof example, in the drawingin twofsections at right angles to, each other, i'n Figs; 1 andZrespectively.V y t AIn; each ofthe cylinders. 3,. there is l.at `acertain comparatively small distance from the, outerl end, whichisnormally .closed by the movable ,cylinder-head,y 4 which forms annoutletevalve, lring-shaped` groovev 15 connected with the suction-pipe6, and ata certain distance inside of this ring-shaped groove there is.another ring-shaped groove 7 connected with a pipe 8,

In the inner end of .the` cylinders .there are recesses 10, and in the.inner end ofthe pistons 11 there 'are corresponding recesses 12. Inthese recesses .the eccentric fastened on the shaft 13,..which eccentrichas an external roller-track 14 and an internal inner rollertrack 15,can freely rotate. Invtlietrecesses 12 onthepistons', there aredisposedvrollers 16 and V17,. which press against the rollery tracks 14 and Vlb'respectively.

When. the shaft 13 is turned,preferably I with great speed, thev shaftbeing,` for instance directly coupled to an electro-motor 9, the pistons11 will be alternately moved in and out of the cylinders 3. yThe lengthlof' l stroke is essentially only equal to the width of the ring-shapedgroove 5,V plus the distance of the latter from thezouter end 'of thecylinders, plus the distance' that the voutlet valve 4 is shiftedtheipiston..

1n the pipe 8 there is a sealing orlubricati ing meansv which, `from thering-shaped groove 7, 'can spread itself out in; the form of 'a film,-'or thin coatingyon the piston. During the 'suction period', which is'.the period is opened during which the piston, by the action of theroller l? and the rollcrtrack 15, is pulled in toward the shaft 13,thereby being removed from the outlet-valve, or the cylinder-head iwhich, by some means of pressure` 18, for instance a spiral spring, 1spressed up against the end of the cylinder, the sealing or lubricatingmeans spread out like a film will, partly due to the movement of thepiston itself and partly due to the suction, be carried all the Way tothe endsurface of the piston and to that part of the cylinder whichsurrounds the Working chamber. When the ring-shaped groove 5 by thepiston, the Working-chamber is filled With the gaseous medium from thesuction-pipe 6, and, together with this gaseous medium, the lubricatingor sealing means will be driven out through the outlet- .J valve dduring the ensuing pressure period.

In the shown example the pressure-valve etis covered by a head in theform of la cap 19 which, on its top, has an opening 2O for the gaseousmedium and, at 'the bottom, an opening 21 for the sealing or lubricatingmeans, which can be conducted from here to a reservoir Q2. rlhe opening2l may, of course, be continued in the shape of a pipe. A suitable pump23, Which can be driven by another eccentric 2a on a shaft 18, pumps thesealing or lubricating means from the reser-v voir 22, or the opening2l, into the pipe 8. The use of a special pumpQ for accomplishing theautomatic circulation of the sealing 1 or lubricating means has theadvantage that the feed-pressure of the latter (the pressure in thering-shaped grooves 7) can thereby be rendered independent both of thepressure-condition in the air-pump, and eventually also of the outerair-pressure and of the differences of altitude. Y

Oppositeto the circulation pump 23, there is disposed another pump 25,Which, with the use of the pump 3, in a vacuum refrigerating plant, canserve for the circulation of salt Water or some other refrigeratingmeans.

ln the shown example, the pump 3, is disposed on the casing of theelectro-motor, and the reservoir 22 is formed of the upper part of saidcasing, a cap Q6, in the capacity of oil-lock, being disposed around thebearing of the shaft 13. The Whole vis surrounded by a suitable jacket27. The relative position of pump andelectromotor is, however, obviouslyimmaterial. The invention is not at all dependent upon the coupling toany definite motor, and, on the Whole, the shown details may be alteredin many Ways Without deviating from the invention.

I claim l. A device of the character described comprising a cylinderprovided near its outer end with an annular inlet for air to becompressed and with an annular sealing groove between said air inlet andthe open end of the cylinder, a movable head adapted to serve as anoutlet valve, elastic means for holding said head normally closedagainst the outer end of said cylinder, means for supplying air to saidannular air inlet, means for supplying a liquid to said annular sealinggroove, a reciprocatory piston in said cylinder, and means for actuatingsaid piston.

2. A device of the character described comprising a cylinder providednear its outer end with an annular inlet for air to be compressed andwith an annular sealing groove between said airinlet and the open end ofthe cylinder, a cap covering the outer end of said cylinder and providedwith a guideway, a movable head disposed between said cap and the boreof the cylinder and provided with a stud engaging said guideway, aspring disposed between said cap and said head and adapted to hold saidhead normally in closed position against said cylinder, means forsupplying air to said annular air inlet, means for supplying a liquid tosaid annular sealing groove, a reciprocatory piston in said cylinder,and means for actuating said piston. v

3. The combination of Vcylinders having their inner ends adjacentlydisposed and provided at their outer ends with outlet valves andadjacent thereto with annular air inlets and adjacent to said air inletswith annular sealing grooves, reciprocatory pistons in said cylindersprovided With rollers, a driving shaft disposed between said cylinderstransversely thereof, a cam on said shaft having internal and externaltracks engaged by said rollers, means for supplying air to said annularair inlets, and means for supplying a sealing liquid to said annularsealing grooves.

l. The combination of cylinders having ytheir inner ends adjacentlydisposed and provided at their outer ends With outletf valves andadjacent thereto with annular air inlets and adjacent to said inletswith annular sealing grooves, reciprocatory pistonsV in said cylinders`provided with rollers, a

driving shaft disposed between said cylinders transversely thereof, acam on said shaft having internal and external tracks engaged by. saidrollers, means for supplying air to said annular airinlets, a pump forsupplying` a sealing liquid to said annulark sealing grooves, and a camon said shaft for actuating said pump.

5. The combination of cylinders having their inner ends adjacentlydisposed and provided at their outer ends with outlet valves andadjacent thereto with annular air inlets and adjacent to said air inletswith annular sealing grooves, reciprocatory pistons in said cylindersprovided with rollers, a driving shaft disposed between said cylinderstransversely thereof, a cam on said shaft having internal and externaltracks engaged by said rollers, means for supplying air to said annularair inlets, a pump for supplying a sealing liquid to said annularsealing grooves, a cam on said shaft .for actuating said pump, and asupplemental pump actuated by said last named cam.

6. The combination of cylinders having their inner ends adjacentlydisposed and provided at their outer ends With outlet valves andadjacent theretowith annular air inlets and adjacent to said air inletsWith annular sealing grooves, reciprocatory pistons in said cylindershaving recesses in their inner ends and provided With rollers disposedin said recesses, a driving. shaft dis-- posed between said cylinderstransversely thereof, a cam on said shaft having internal and externaltracks engaged by said rollers, ineans for supplying air to said nannular air inlets, and means tor supplying a sealing liquid to saidannular sealing grooves.

In testimony, that I claim the foregoing as my invention, I have signedmy vname in presence of tWo subscribing Witnesses.

PAUL SCHOU. Witnesses:

P. HoFMAN-BANG, ERNEST BOUTARD.

Copies of this patent may be obtained for ve cents each, by addressingthe Conimssloner of Patents, Washington, D. C.

